Question

Calculati: E(x)=(1/x+2 - 1/x-2 + x+1/x la a 2 a - 4) : x la a 2 -9/ x la a 2 +x-6

Answer 1

$\frac{x-2-x-2+x+1}{ (x-2)(x+2)}* \frac{(x+3)(x-2)}{(x-3)(x+3)} = \frac{(x-3)(x+3)}{(x+2)(x-3)(x+3)} = \frac{1}{x+2}$